Five F135 engines have been pulled from F-35s after failing an inspection regime that was instituted after the June 23 fire

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Five F135 engines have been pulled from F-35s after failing an inspection regime that was instituted after the June 23 fire. One of the failed engines was removed from F-35 CF-9 (the ninth production F-35C), an aircraft with fewer than 70 flight hours, according to a retired military officer and JSF program veteran.

Investigation has narrowed the root causes down to four key suspects, according to Bogdan. An important factor in the investigation was that at least two of the failed F135s were not high-time engines. AF-27 made its first flight in late April 2013, and CF-9 flew three months later. According to information provided by the former military officer, when CF-9 was grounded in late July, it had accumulated 66.7 engine flight hours and 146.5 engine operating hours since delivery. It had passed two borescope inspections after July 13, with only 1.3 engine flight hours between the previous inspection and the check it failed.

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